Speed-indicator



(No Model.)

L. S. STARRETT.

' SPEED INDICATOR.

No. 601,800. Patented Apr. 5, 1898.

FT Z.

WIT M55555- INVENTEIR- P\TTY UNITED STATES PATENT OFFICE.

LAROY S. STARRETT, OF ATHOL, MASSACHUSETTS.

SPEED-INDICATOR.

SPECIFICATION forming part of Letters Patent No. 601,800, dated April 5, 1898.

A li ati fil d December 16, 1895. Serial No. 572,264. (No model.)

To aZZ whom it may concern-.-

Be it known that I, LAROY S. STA RETT, of Athol, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Speed Indicators, of which the following, taken in connection with the accompanying drawings, is a specification.

The object of my invention is to provide a speed-indicator in which frictional engage- V ment of the spindle or of its cap or auxiliary sleeve with the end of the shaft the speed of which is to be tested is attained by means of a tip of yielding material which by its inherent resilience will readily adhere to the shaft end under amoderate pressure thereon. more perfect contact than heretofore is thus secured whether the shaft have a cupped end or a pointed one, since the tip of the cap or of the spindle is shaped to correspond and fits by reason of its yielding nature whether held axially true to the shaft or not.

My invention consists in a speed-indicator of otherwise suitable construction combined with an auxiliary cap or sleeve having at its outer end a conical tip of vulcanized rubber or like yielding material adapted for frictional contact with the cupped end of a revolving shaft and having within the chambered extremity of the spindle a yielding plug formed with an axial conical socket for frictional contact with the pointed end of a shaft. By means of these yielding parts the instrument is adapted for engagement with shafts gen- 'erally in a manner much more satisfactory than under the usual construction, where all the parts are of rigid material.

In the drawings, Figure 1 is a plan of one of my improved instruments shown nearly full size. Fig. 2 is an enlarged view of a portion thereof, partly in longitudinal section.

A represents the body of the instrument inclosing the gearing.

B is the spindle, entering the bodyA and provided at its outer end with an auxiliary sleeve or cap (I, fitting snugly thereon and formed with a raised milled ring or peripheral band 0 about midway of its length.

The outer end of the sleeve C is provided with a yielding plug of vulcanized rubber or the like formed with a conical point or tip E so shaped as to fit into and engage frictionally with the common cupped end of a rotating shaft and by pressure thereon to communicate to the inclosed gearing and to the index the motion of the revolving shaft without slip or inaccuracy. In addition to this conical tipped sleeve 1 also recess the outer end of the spindle B and insert therein a tight-fitting rubber plug D, having a terminal concavity or socket of conical form adapted when the sleeve 0 is removed to receive the pointed end of a rotating shaft or spindle the speed of which is to be measured. Both forms of the present improvement are shown in Fig. 2, the socketed plug D being dormant when the sleeve 0 is in position, but being in readiness for use when required by the simple removal of said sleeve.

I claim as my invention-- In a speed-indicator, the combination with the chambered spindle B and its conicallyrecessed yielding plug D, of the auxiliary sleeve 0 fitting frictionally over and around the chambered end of the spindle, and having the yielding conical tip E, substantially as and for the purpose set forth.

I11 testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, 011 this 2tth day of October, A. D. 1895.

LAROY S. STARRETT.

lVitnesses:

MINERVA R. PITTS, A. 'H. SrENoER. 

